r20146 - gnucash/trunk/src/engine - Prevent a crash if gnc_sx_sxes_reverencing_account called when book has no sxes.

[John Ralls]

Author: jralls
Date: 2011-01-22 17:59:42 -0500 (Sat, 22 Jan 2011)
New Revision: 20146
Trac: http://svn.gnucash.org/trac/changeset/20146

Modified:
   gnucash/trunk/src/engine/SX-book.c
Log:
Prevent a crash if gnc_sx_sxes_reverencing_account called when book has no sxes.